#!/bin/bash

RRDTOOL=($(which rrdtool))

function rrdinfo() {
  $RRDTOOL info $1 \
  | while read line; do
      key=${line%% = *}
      pri=${key%%[*}
      ind=${key%%]*}
      ind=${ind##*[}
      sub=${key##*.}
      value=${line##* = }
      num=${value/0000e/e}
      num=${num/0000e/e}
      num=${num/00e/e}
      num=${num/0e/e}
      num=${num/.e/e}
      num=${num/e+00/}
      num=${num/#NaN/U}
      case "$pri" in
        filename)
          echo "rrdtool create $value"
          ;;
        step)
          echo -e "\t--step $value"
          ;;
        ds)
          case "$sub" in
            value)
              echo -e "\tDS:$DS:$TYPE:$HB:$MIN:$MAX"
              ;;
            type)
              DS=$ind
              TYPE=${value//\"}
              case "$TYPE" in
                GAUGE|COUNTER|DERIVE|ABSOLUTE)
                  # ok
                  ;;
                *)
                  echo "unknown data source type $TYPE"
                  exit 1
                  ;;
              esac
              ;;
            minimal_heartbeat)
              HB=$value
              ;;
            min)
              MIN=$num
              ;;
            max)
              MAX=$num
              ;;
          esac
          ;;
        rra)
          case "$sub" in
            unknown_datapoints)
              if [ -n "$CF" ]; then
                echo -e "\tRRA:$CF:$XFF:$PDPS:$ROWS"
                CF=""
              fi
              ;;
            cf)
              CF=${value//\"}
              case "$CF" in
                AVERAGE|MIN|MAX|LAST)
                  # OK
                  ;;
                *)
                  echo "unknown consolidation $CF"
                  exit 1
                  ;;
              esac
              ;;
            xff)
              XFF=$num
              ;;
            pdp_per_row)
              PDPS=$num
              ;;
            rows)
              ROWS=$num
              ;;
          esac
          ;;
      esac
    done
    echo ""
}
  
while [ -n "$1" ]; do
  if [ -r $1 ]; then
    rrdinfo $1
  fi
  shift
done